Industrial plant double-ended switchgear single line diagram
This feeder distribution single line diagram represents a double-ended 480 V switchgear lineup for an industrial plant. Two 2500 kVA transformers each feed a 3200 A main and their own bus section. A normally open 3200 A tie breaker links the sections for a planned maintenance or contingency transfer.
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Scenario
This industrial switchgear arrangement divides plant distribution across two transformer-fed buses, with a normally open bus tie for maintenance or contingency transfer.
Key decisions
- Dual transformers: Two 2500 kVA sources supply independent 480 V bus sections.
- Normally open tie: The 3200 A tie permits a controlled transfer without paralleling sources.
- MCC feeder: A dedicated 800 A feeder serves motor control equipment.
- Process segregation: The high-demand process line is fed from Bus A.
- Utilities separation: Plant utilities stay on the separate Bus B section.
When to reuse this
Use this for a medium industrial facility needing maintainable LV distribution. Protection settings, source impedance, and transfer interlocking need coordination studies.
Frequently asked questions
Why is the tie breaker normally open?
Can one transformer carry both buses?
What is an MCC?
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